Westermo RM-115S - Manual (Page 5)

115S Serial I/O Module User Manual
man_115S_1.14.docx Page 5
APPENDIX D. SPECIFICATIONS .............................................................................. 55
APPENDIX E. RS232 WIRING .................................................................................... 57
1 Overview
The ELPRO 115S modules are designed to provide I/O expansion for other ELPRO
products like 105U and 905U modules. The 115S modules support the ELPRO E-Series
protocol, and communicate serially via RS232 or RS485. Configuration is done via the
ELPRO E-Series configuration utility.
The 115S modules also support MODBUS protocol. They may be used as a MODBUS
slave with any 3
rd
-party MODBUS device, or with the ELPRO 105U-G or 905U-G
modules using MODBUS. They support both MODBUS ASCII protocol, and serial un-
signed MODBUS RTU, also known as “MODBUS binary”. The Modbus slave address of
the 115S is selected via two rotary switches on the bottom panel of the case.
All 115S models provide digital inputs and outputs. Specific models provide analog
inputs or analog outputs. Pulsed inputs and pulsed outputs are also available. Several
modules may be connected to one master, allowing any combination of I/O types.
Figure 1-1 shows a diagram of a 115S module with parts labelled.